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Finding the Fourth Proportional to 1,027.68, 1,417.68 and 717.36

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Solution

The fourth proportional to 1,027.68, 1,417.68 and 717.36 is: 989.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.68 : 1,417.68 = 717.36 : x
  2. Step 2: Convert to fraction form
    1,027.68/1,417.68 = 717.36/x
  3. Step 3: Cross multiply
    1,027.68x = 1,417.68 × 717.36
  4. Step 4: Simplify right side
    1,027.68x = 1,016,986.92
  5. Step 5: Solve for x
    x = 1,016,986.92/1,027.68
  6. Step 6: Final answer
    x = 989.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.